A nurse is caring for a client with acute myocardial infarct… | 마이메르시 MyMerci
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문제

A nurse is caring for a client with acute myocardial infarction

해설
Continuous cardiac monitoring for life-threatening arrhythmias is the highest priority in acute MI, as arrhythmias are the leading cause of death in the first 24-48 hours. Other interventions like pain management and ECG are important but secondary to immediate life threats.

심화 해설

Core Nursing Explanation Key Concept Analysis: This question tests the priority nursing intervention for a patient with an Acute Myocardial Infarction (AMI). The core principle is the ABC (Airway, Breathing, Circulation) priority framework and the concept of Key Point! managing immediate life threats first. In AMI, the death of heart muscle disrupts the electrical conduction system, making the patient highly vulnerable to lethal arrhythmias like Ventricular Fibrillation (V-fib) or Ventricular Tachycardia (V-tach), which are the most common causes of death in the early hours post-MI.

Answer Rationale: Option ②, "Monitor cardiac rhythm and assess for life-threatening arrhythmias," is the correct answer because it directly addresses the greatest immediate risk to the patient's life. This intervention is continuous and proactive, allowing for the rapid detection and treatment of arrhythmias before they lead to cardiac arrest. It aligns with the nursing process by prioritizing Assessment for the most critical complication.

Distractor Analysis:
  • Option ① (Administer pain medication): While relieving Angina is crucial (pain increases myocardial oxygen demand), it is not the highest priority. A patient in V-fib will die within minutes regardless of pain control. Pain management is a very close second priority.
  • Option ③ (Obtain a 12-lead ECG): This is a vital diagnostic tool to confirm the MI and its location, but it is a single-point assessment. Continuous monitoring (option ②) provides ongoing surveillance, which is more critical for immediate safety. The ECG is important but follows initial stabilization and monitoring.
  • Option ④ (Educate about lifestyle modifications): Patient education is essential for secondary prevention but is a Watch out for confusion! long-term, discharge-planning intervention. It is inappropriate as a priority during the acute, unstable phase of the illness.
Related Concepts: This prioritization follows the "Maslow's Hierarchy of Needs" and "Airway, Breathing, Circulation (ABC)" models. Circulation is compromised in AMI, and the threat to circulation from arrhythmias is addressed first. The "MONA" mnemonic (Morphine, Oxygen, Nitrates, Aspirin) for initial MI management is also relevant, but note that oxygen is no longer routinely administered unless the patient is hypoxic.

Concept Summary
ConceptDescriptionPriority in AMI
Life-Threatening ArrhythmiasV-fib, V-tach, Asystole. Leading cause of early death post-MI.Key Point! Highest Priority (Continuous monitoring)
Pain ReliefReduces sympathetic stress and myocardial O2 demand (e.g., Nitroglycerin, Morphine).High Priority (Immediate but secondary to monitoring)
Diagnostic Confirmation12-lead ECG, Cardiac enzymes (Troponin).Essential, but follows initial safety measures
Patient EducationDiet, exercise, medication adherence for secondary prevention.Important for Discharge Planning (Not an acute priority)

Side-by-Side Comparison!
InterventionPurposeTiming & Priority
Continuous Cardiac MonitoringDetect & allow immediate treatment of lethal arrhythmias (V-fib/V-tach).Immediate / Highest Priority (First few minutes of care)
Administering Pain MedicationRelieve ischemic pain, decrease anxiety and cardiac workload.Very High / Done concurrently after ensuring monitoring is in place.
Obtaining a 12-lead ECGConfirm diagnosis (ST-elevation vs. non-ST-elevation MI), locate infarct area.High / Done as soon as possible after initial assessment.

Anatomy, Physiology & Pharmacology Points
  • Pathophysiology: AMI causes myocardial necrosis. The infarcted area and the surrounding ischemic zone become electrically unstable, acting as a focus for re-entry circuits or ectopic beats, leading to arrhythmias.
  • Key Arrhythmia: Ventricular Fibrillation (V-fib) is a chaotic, quivering of the ventricles that produces no cardiac output. It requires immediate defibrillation.
  • Drug Connection: Drugs like Lidocaine or Amiodarone may be used to suppress ventricular arrhythmias. Beta-blockers (e.g., Metoprolol) are given to reduce myocardial oxygen demand and have anti-arrhythmic properties.

Memory Tips
  • Mnemonic: "Monitor Before Morphine" – Reminds you that detecting lethal rhythms (monitoring) is more immediately critical than treating pain (morphine).
  • Think: "What kills first?" In the first hour of an MI, it's not the damaged muscle itself, but the electrical chaos it causes. Your first job is to watch for that chaos.

High-Frequency NCLEX Topics The NCLEX-RN loves testing priority-setting in emergency situations. AMI is a classic scenario. Remember: Assess for and manage threats to ABCs first. Any question asking for the "priority," "first," or "most important" action in an acute MI will almost always point to an intervention related to circulation and arrhythmia monitoring.
Watch Out for Question Variations!
  • If the patient is currently complaining of 10/10 chest pain: The answer might shift to pain management if the question establishes that monitoring is already in place. The stem here implies a new admission where monitoring is not yet confirmed.
  • If the patient becomes unresponsive with no pulse: The priority immediately changes to initiating CPR and activating the emergency response system/defibrillation.
  • If the question is about discharge teaching: Then option ④ (lifestyle education) becomes the correct priority for that phase of care.

임상 시나리오

Nursing Clinical Practice Guide Clinical Scenario: You are the nurse receiving a 58-year-old male, Mr. Johnson, in the Emergency Department. He was brought in by ambulance with severe, crushing substernal chest pain radiating to his left arm, diaphoretic, and anxious. The paramedics have placed him on oxygen and started an IV line. The physician's initial order set for "Rule Out MI" is at the bedside.

Nursing Intervention Strategy:
  1. Immediate Action (First 2-5 minutes):
    • Quickly transfer the patient to a monitored bed/cardiac telemetry unit.
    • Apply continuous cardiac monitor leads (5-lead system for best viewing) yourself. Do not wait for a tech.
    • Assess rhythm: Is it a perfusing rhythm? Or is it V-fib/V-tach/asystole?
    • Perform a focused assessment: Vital signs, pain scale, breath sounds, skin color.
  2. Concurrent Interventions (Next 5-10 minutes):
    • While monitoring, obtain the 12-lead ECG per protocol.
    • Administer prescribed medications: Aspirin (chewed), Nitroglycerin SL/spray, Morphine IV for pain unrelieved by nitrates.
    • Draw blood for cardiac enzymes (Troponin I/T), CBC, BMP, coagulation studies.
  3. Ongoing Monitoring & Care:
    • Continuously observe the telemetry screen. Know where the code button and defibrillator are.
    • Reassess pain and vital signs frequently (every 5-15 minutes initially).
    • Prepare the patient for possible procedures (cardiac catheterization, thrombolytics).
Patient Safety and Precautions:
  • Never leave the acutely symptomatic MI patient unattended until stable on a monitor.
  • Medication Caution: Nitroglycerin can cause profound hypotension. Morphine can cause respiratory depression and hypotension—monitor BP and respirations closely.
  • Contraindication Awareness: Know contraindications for thrombolytics (e.g., recent surgery, active bleeding, stroke).

Nursing Procedure & Medication Flow Setting Up Cardiac Monitoring: 1. Place electrodes on clean, dry skin: Right arm (RA) – right infraclavicular fossa; Left arm (LA) – left infraclavicular fossa; Right leg (RL) – right lower abdomen; Left leg (LL) – left lower abdomen; V1 – 4th intercostal space, right sternal border. 2. Select "Lead II" or "MCL1" on the monitor for clear P waves and QRS complexes. 3. Set alarm parameters appropriately (e.g., heart rate limits 50-120, alarm for asystole/V-fib).

Medication Administration for AMI:
DrugActionNursing Considerations
Aspirin (162-325 mg)Anti-platelet; inhibits thromboxane A2.Have patient chew it for rapid buccal absorption. Check for allergy.
Nitroglycerin (SL/Spray)Venodilator; reduces preload and myocardial O2 demand.Monitor for headache, hypotension. If systolic BP < 90 mmHg, hold and notify MD.
Morphine Sulfate (IV)Analgesic; reduces pain, anxiety, and preload.Give in small doses (2-4 mg IV). Have Naloxone (Narcan) available. Monitor respirations.
Beta-Blocker (e.g., Metoprolol)Reduces heart rate, BP, and contractility (decreases O2 demand).Hold if heart rate < 60 bpm or systolic BP < 100 mmHg. Monitor for bronchospasm in asthma/COPD patients.

A Word from Your Senior Nurse "In the chaos of a new MI admission, your eyes must constantly flick between the patient's face and the monitor screen. That green tracing is their lifeline. I've seen a patient talking one second and in V-fib the next. Your vigilance in monitoring isn't just a task—it's the act of standing guard over their heart's electrical stability. When you study for the NCLEX, internalize this: priority is about what will kill the patient fastest if you miss it. In AMI, that's an unseen arrhythmia. Master this thought process, and you'll not only answer these questions correctly, you'll be the calm, competent nurse everyone wants at the bedside during a real crisis."

핵심 개념

  • Acute Myocardial Infarction — The death of heart muscle tissue due to prolonged lack of oxygen, typically caused by a blockage in a coronary artery.
  • Ventricular Fibrillation (V-fib) — A life-threatening cardiac arrhythmia characterized by chaotic, ineffective quivering of the ventricles, resulting in no cardiac output. Requires immediate defibrillation.
  • Telemetry Monitoring — The continuous observation of a patient's heart rhythm via electrodes attached to the chest, transmitting data to a central monitoring station.
  • MONA — A traditional mnemonic for initial management of suspected MI: Morphine, Oxygen, Nitrates, Aspirin. Note: Oxygen is now only given if the patient is hypoxic (SpO2 < 90%).
  • Reperfusion Therapy — The goal of AMI treatment to restore blood flow to the blocked coronary artery, either via Percutaneous Coronary Intervention (PCI/angioplasty with stent) or thrombolytic ("clot-busting") medication.

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